broken-neees
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A really broken NEEES emulator that introduces glitches and random bugs on purpose!
109 lines (103 loc) • 8.21 kB
JavaScript
;
function _typeof(obj) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) { return typeof obj; } : function (obj) { return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }, _typeof(obj); }
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
var _Mapper2 = _interopRequireDefault(require("../lib/Mapper"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); enumerableOnly && (symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; })), keys.push.apply(keys, symbols); } return keys; }
function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = null != arguments[i] ? arguments[i] : {}; i % 2 ? ownKeys(Object(source), !0).forEach(function (key) { _defineProperty(target, key, source[key]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)) : ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } return target; }
function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return _typeof(key) === "symbol" ? key : String(key); }
function _toPrimitive(input, hint) { if (_typeof(input) !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (_typeof(res) !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
function _get() { if (typeof Reflect !== "undefined" && Reflect.get) { _get = Reflect.get.bind(); } else { _get = function _get(target, property, receiver) { var base = _superPropBase(target, property); if (!base) return; var desc = Object.getOwnPropertyDescriptor(base, property); if (desc.get) { return desc.get.call(arguments.length < 3 ? target : receiver); } return desc.value; }; } return _get.apply(this, arguments); }
function _superPropBase(object, property) { while (!Object.prototype.hasOwnProperty.call(object, property)) { object = _getPrototypeOf(object); if (object === null) break; } return object; }
function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); Object.defineProperty(subClass, "prototype", { writable: false }); if (superClass) _setPrototypeOf(subClass, superClass); }
function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } else if (call !== void 0) { throw new TypeError("Derived constructors may only return object or undefined"); } return _assertThisInitialized(self); }
function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }
function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf.bind() : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
/**
* It provides bank-switching capabilities, just by writing a byte to any address on PRG ROM space.
* CPU $8000-$BFFF: 16 KB switchable PRG ROM bank
* CPU $C000-$FFFF: 16 KB PRG ROM bank, fixed to the last page
* The CHR memory is usually RAM, mapped at PPU addresses $0000-$1FFF.
*/
var UxROM = /*#__PURE__*/function (_Mapper) {
_inherits(UxROM, _Mapper);
var _super = _createSuper(UxROM);
function UxROM() {
_classCallCheck(this, UxROM);
return _super.apply(this, arguments);
}
_createClass(UxROM, [{
key: "onLoad",
value: function onLoad() {
this._state = {
page: 0
};
}
}, {
key: "cpuRead",
value: function cpuRead(address) {
if (address >= 0x4020 && address <= 0x7fff) {
// Unused
return 0;
} else if (address >= 0x8000 && address <= 0xbfff) {
// CPU $8000-$BFFF: 16 KB switchable PRG ROM bank
return this.$getPrgPage(this._state.page)[address - 0x8000];
} else if (address >= 0xc000 && address <= 0xffff) {
// CPU $C000-$FFFF: 16 KB PRG ROM bank, fixed to the last page
return this.$getPrgPage(this.prgPages.length - 1)[address - 0xc000];
}
}
}, {
key: "cpuWrite",
value: function cpuWrite(address, value) {
if (address >= 0x8000) this._state.page = value;
}
}, {
key: "ppuRead",
value: function ppuRead(address) {
if (!this.cartridge.header.usesChrRam) {
return; // (only CHR-RAM is writable)
}
// PPU $0000-$1FFF: 8 KB of CHR RAM
return this.$getChrPage(0)[address];
}
}, {
key: "ppuWrite",
value: function ppuWrite(address, value) {
if (!this.cartridge.header.usesChrRam) {
return; // (only CHR-RAM is writable)
}
// [!!!]
if (this.cartridge.isBroken) address += 3;
// PPU $0000-$1FFF: 8 KB of CHR RAM
this.$getChrPage(0)[address] = value;
}
/** Returns a snapshot of the current state. */
}, {
key: "getSaveState",
value: function getSaveState() {
return _objectSpread(_objectSpread({}, _get(_getPrototypeOf(UxROM.prototype), "getSaveState", this).call(this)), {}, {
page: this._state.page
});
}
/** Restores state from a snapshot. */
}, {
key: "setSaveState",
value: function setSaveState(saveState) {
_get(_getPrototypeOf(UxROM.prototype), "setSaveState", this).call(this, saveState);
this._state.page = saveState.page;
}
}]);
return UxROM;
}(_Mapper2.default);
exports.default = UxROM;